//
// detail/scheduler_operation.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef ASIO_DETAIL_SCHEDULER_OPERATION_HPP
#define ASIO_DETAIL_SCHEDULER_OPERATION_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/error_code.hpp"
#include "asio/detail/handler_tracking.hpp"
#include "asio/detail/op_queue.hpp"

#include "asio/detail/push_options.hpp"

namespace asio {
    namespace detail {

        class scheduler;

// Base class for all operations. A function pointer is used instead of virtual
// functions to avoid the associated overhead.
        class scheduler_operation ASIO_INHERIT_TRACKED_HANDLER
                {
                        public:
                        typedef scheduler_operation operation_type;

                        void complete(void* owner, const asio::error_code& ec,
                        std::size_t bytes_transferred)
                        {
                            func_(owner, this, ec, bytes_transferred);
                        }

                        void destroy()
                        {
                            func_(0, this, asio::error_code(), 0);
                        }

                        protected:
                        typedef void (*func_type)(void*,
                        scheduler_operation*,
                        const asio::error_code&, std::size_t);

                        scheduler_operation(func_type func)
                        : next_(0),
                        func_(func),
                        task_result_(0)
                        {
                        }

                        // Prevents deletion through this type.
                        ~scheduler_operation()
                        {
                        }

                        private:
                        friend class op_queue_access;
                        scheduler_operation* next_;
                        func_type func_;
                        protected:
                        friend class scheduler;
                        unsigned int task_result_; // Passed into bytes transferred.
                };

    } // namespace detail
} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // ASIO_DETAIL_SCHEDULER_OPERATION_HPP
